The aperture coupled patch was introduced by Pozar in 19851 I]. Since that time researchers have introduced countless variation on the original theme. In this paper we start with the arrangement discussed by Zurcher[2,3] and use an additional substrate to extend it to dual polarisation. Both dual linear and dual circular configurations are considered. A number of other dual polarised versions of the aperture coupled patch are found in literature[4,5,6] but most suffer from either a small bandwidth, poor cross polarisation isolation or require complicated feeding structures. The configuration discussed in this paper obtains the bandwidth advantages of the patches of the single polarised version and maintains a high degree of polarisation isolation. It employs a symmetric feeding structure. The importance of this symmetry property is discussed by Pozar. We focus on dual polarised antennas where both polarisations are in the same band but frequency shifts of up to 20% between the bands have also been achieved. The frequencies are chosen to correspond with the Japanese digital mobile communications system. The basic design was done using HP Momentum and the final design used empirically data combined with an optimisation scheme.
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